JP6775656B2 - Workbench for aerial work platforms - Google Patents

Description

The present invention relates to a workbench for aerial work platforms.

When performing aerial work at a construction site in civil engineering construction, a temporary scaffold is assembled from a stable ground surface to the upper work position, and a worker moves up and down the stairs provided on the temporary scaffold (patented). Reference 1).
Alternatively, an aerial work platform is prepared, and the workbench on which the worker is boarded is raised and lowered to the work position by an elevating device (see Patent Document 2).

JP-A-11-210231 Japanese Unexamined Patent Publication No. 2013-14418

However, temporary scaffolding requires a great deal of time and materials because it is constructed by assembling various members such as building frames, pipe materials, braces, treads, handrails, and stairs from the ground surface to the upper working position. However, there is a disadvantage that the cost is high.
On the other hand, when using an aerial work platform, the cost can be reduced compared to when using a temporary scaffolding, but it is necessary to raise and lower the workbench every time the height of the work position is changed, and the workbench It is difficult to work at a position above the upper limit position, and there is room for improvement in improving work efficiency.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a workbench for aerial work platforms, which is advantageous in improving work efficiency while suppressing the cost required for aerial work. It is in.

In order to achieve the above object, the present invention is a workbench for a high-altitude work vehicle attached to an elevating device that can be elevated, and the elevating device is connected to the lower surface thereof, and a first handrail stands around the workbench. A floor portion having a first rectangular shape in plan view and a second contour having a plurality of floors formed by columns and beams on the floor portion and having a smaller plan view shape than the first rectangle. The long side and the short piece form a rectangle, and the long side and the short piece are provided with a pedestal parallel to the long side and the short side of the first rectangle. The pedestal is formed on a plurality of floors by columns and beams, and the floor portion to each floor. The floor and the pedestal have a length along the long side and a width along the short side of the rectangles forming their plan view shapes, and have a staircase for ascending and descending to the beams constituting the above. A floor plate is installed on a beam constituting the top floor, and a second handrail is erected so as to surround the circumference of the floor plate, and the plane of the top floor composed of the floor plate and the second handrail. The visual shape presents a third rectangle having a first long side and a second long side with a contour smaller than the second rectangle, and when viewed in a plan view, the first long side of the third rectangle. The long side coincides with one long side of the second rectangle, and the pillars provided on the top floor and the floor immediately below the top floor are described at the location of the first long side. It is provided extending from the first floor of the gantry to the top floor, and at the portion of the second long side, it is inclined in a direction gradually approaching the first long side from the floor directly below the top floor to the top. The gantry between the pillar from the floor directly below the top floor to the first long side and the inclined pillar from the floor directly below the top floor to the second long side. The distance along the width direction is characterized in that it is formed in a dimension that gradually decreases toward the upper side .

According to the present invention, various aerial work can be performed within a height range over a plurality of floors without raising and lowering the workbench by an elevating device, which is advantageous in improving the efficiency of aerial work.
Further, when the workbench is raised to the highest position by the elevating device, it is possible to perform the work at a high place because the gantry has a plurality of floors even at a high place that cannot be reached by the conventional workbench.

It is a front view of the workbench for the aerial work platform which concerns on embodiment. FIG. 5 is a sectional view taken along line AA of FIG. It is a top view of the workbench for the aerial work platform which concerns on embodiment. It is a perspective view of the workbench for aerial work platforms seen from the direction of arrow B of FIG. It is a block diagram which shows the structure of the control system of the workbench for the aerial work platform which concerns on embodiment. It is an operation flowchart of the workbench for the aerial work platform which concerns on embodiment.

Hereinafter, the present embodiment will be described with reference to the drawings.
First, the aerial work platform will be described.
As shown in FIG. 1, the aerial work platform 10 has a vehicle body (not shown) that runs on the ground, a boom 12 that is provided on the vehicle body and is supported and expanded and contracted undulatingly, and a boom 12 that undulates and expands and contracts. A plurality of hydraulic cylinders and a workbench 14 connected to the tip of the boom 12 are provided.

The workbench 14 is raised and lowered by the undulation and expansion and contraction of the boom 12. Therefore, in the present embodiment, the lifting device is configured by the boom 12 and each of the hydraulic cylinders described above.
The elevating device is not limited to the configuration using the boom 12 and the hydraulic cylinder, and includes a scissors link formed by swingably connecting a plurality of arm members and a hydraulic cylinder that expands and contracts the scissors link. Various conventionally known lifting devices such as a scissor link type lifting device composed of the above can be used.

As shown in FIGS. 1 to 5, the workbench 14 includes a floor portion 16, a gantry 18, an operation portion 20, and an object alarm device 22.
As shown in FIGS. 1 to 4, the floor portion 16 is formed around a frame 24 formed of an elongated member in a rectangular frame shape, a plurality or one floor plate 26 provided on the frame 24, and the floor plate 26. It is composed of erected handrails 28.
Various conventionally known members such as H-shaped steel can be used as the elongated member, but using a lightweight member is advantageous in reducing the weight of the gantry 18.
In the present embodiment, as shown in FIG. 3, a reinforcing member 30 for reinforcing the frame 24 is provided inside the frame 24, and the tip of the boom 12 is connected to the reinforcing member 30 via the leveling device 13. It is connected. Then, when the boom 12 rises and falls, the leveling device 13 is configured to keep the workbench 14 in a horizontal state at all times. The leveling device 13 may be any device as long as it keeps the workbench 14 in a horizontal state at all times when the boom 12 rises and falls, and various conventionally known structures can be adopted.

As shown in FIG. 3, the gantry 18 is provided on an area smaller than the area of the floor portion 16, and the portion of the floor portion 16 excluding the gantry 18 is a passage 32 for the worker P to come and go.
In detail, the floor portion 16 has a rectangular shape, and the gantry 18 has a rectangular shape in a plan view, and more specifically, a rectangular shape in a plan view.
The gantry 18 is arranged so that the long side of one of the two long sides of the rectangular shape in a plan view is brought closer to the long side of one of the two long sides of the rectangle of the floor portion 16.
Then, the passage 32 is between the other long side of the two long sides of the rectangular view of the gantry 18 and the other long side of the two long sides of the rectangle of the floor portion 16 and the gantry. It is provided between the two short sides of the rectangular view of 18 and the two short sides of the rectangle of the floor portion 16.
Therefore, the gantry 18 can be arranged close to the place where the aerial work is performed in a long range in the lateral direction (long range in the long side direction), which is advantageous in efficiently performing the work on each floor of the gantry 18. ..
Further, since the passage 32 allows the floor portion 16 to be moved back and forth between the long side direction and the short side direction, it is advantageous in improving the usability of the floor portion 16.
Further, since the contour of the gantry 18 in a plan view is smaller than the contour of the floor portion 16, the gantry 18 can be positioned in a space narrower than the contour of the floor portion 16.
Therefore, when the space for aerial work is a narrow space sandwiched between two opposing walls or a narrow space surrounded by a plurality of walls, and a normal workbench 14 cannot be accommodated. Even if there is, the gantry 18 can be positioned in a narrow space, and the worker P can work at a high place from the gantry 18 in that state, which is advantageous in improving work efficiency.

As shown in FIGS. 1 to 4, the gantry 18 is formed on a plurality of floors by columns 34 and beams 36, is formed on the third floor in the present embodiment, and moves up and down from the floor portion 16 to the beams 36 constituting each floor. It is equipped with a staircase 38 for the purpose.
Various conventionally known members such as square steel pipes can be used for the columns 34 and beams 36, but square or circular hollow shaped steel made of a lightweight metal material such as an aluminum alloy, or a lightweight, strong and rigid composite. The use of a hollow square pipe, a circular pipe, or the like made of a resin material is advantageous in reducing the weight of the gantry 18.
A plurality of pillars 34 are erected along a pair of long sides and a pair of short sides of a rectangular shape in a plan view.
The beam 36 is bridged over a plurality of columns 34 along a pair of long sides and a pair of short sides of a rectangular shape in a plan view, and is provided between the columns 34 facing each other provided on the pair of long sides as needed. It is hung on.
On the four sides of each floor of the gantry 18, the braces 40 are cross-shaped across a plurality of rectangular openings formed by the columns 34 and the beams 36. By providing the brace 40, the brace 40 functions as a worker fall prevention member, and at the same time, the strength and rigidity of the gantry 18 are increased.

As shown in FIG. 4, the floor plate 42 is installed on the beam 36 on the third floor constituting the top floor among the beams 36 constituting the plurality of floors, and the handrail 44 is erected so as to surround the floor plate 42. ing.
In the present embodiment, as shown in FIGS. 1 and 2, a plurality of pillars 34 constituting the gantry 18 are provided so as to extend above the beams 36 on the third floor to form the pillars 4402 of the handrail 44. There is.
The handrail 44 is composed of a plurality of columns 4402 and a plurality of elongated members 4404 bridged between the columns 4402.
Therefore, the handrail 44 functions as a worker fall prevention member, which is advantageous in ensuring the safety of work on the top floor.

As shown in FIG. 4, the operation unit 20 is attached to a mounting member (not shown) erected from the floor unit 16 (FIG. 1), and is operated by a worker P on the floor unit 16 to describe the operation unit 20. Each of the hydraulic cylinders of the above is operated to raise and lower the boom 12, and the workbench 14 is moved up and down.

As shown in FIG. 5, the object alarm device 22 includes a plurality of surveillance cameras 46, a worker detection unit 48, a voice generation unit 50, and a control unit 52.
The surveillance camera 46 constitutes an object detection unit, and is provided on the workbench 14 to detect an object in the space on the side and above the gantry 18.
In the present specification, the object refers to an object such as a structure located on the side or above of the gantry 18.

In the present embodiment, as shown in FIGS. 1 to 4, one surveillance camera 46 is provided at each of the handrails 28 of the floor portion 16 near both ends of the two long sides of the floor portion 16. Further, one of the handrails 44 on the third floor constituting the uppermost floor of the gantry 18 is provided at each of the two long sides of the gantry 18 near both ends. Therefore, a total of eight surveillance cameras 46 are provided on the handrail 28 of the floor 16 and four on the handrail 44 on the top floor of the gantry 18. The number and mounting positions of the surveillance cameras 46 are appropriately determined according to the size and shape of the gantry 18.
Each surveillance camera 46 can image a 360-degree range centered on the optical axis extending upward in the vertical direction, and can image a 180-degree range centered on the optical axis in a plane including the optical axis. It is provided, and the captured image data is supplied to the control unit 52.
The range that can be imaged by the surveillance camera 46 is not limited to the above angle range, but according to the present embodiment, a wide area can be imaged by one surveillance camera 46 without causing a blind spot. Therefore, it is advantageous in reliably monitoring the object.

The worker detection unit 48 detects that the worker P is on the gantry 18 and supplies the detection result to the control unit 52.
It suffices if the worker detection unit 48 can cover all the places where the worker P can enter in the gantry 18, and various conventionally known human feelings using infrared rays, ultrasonic waves, visible light, etc. as the worker detection unit 48 Sensors can be used, and one or more motion sensors may be provided.
Further, the worker detection unit 48 may be provided with a camera and an image processing unit that determines the presence or absence of the worker P based on the image information captured by the camera.

The voice generation unit 50 generates a predetermined warning sound or a warning announcement sound based on the control of the control unit 52.
As such an audio generation unit 50, for example, an audio signal generation circuit that generates an audio signal, an amplifier that amplifies the audio signal, and a speaker that sounds based on the amplified audio signal are optionally used. is there.

The control unit 52 includes a CPU, a ROM for storing and storing a control program, a RAM as an operating area for the control program, an EEPROM for rewritably holding various data, an interface unit for interfacing with peripheral circuits, and the like. It is composed.
The control unit 52 functions as an approach determination unit 52A and an alarm generation unit 52B by executing the control program.

The approach determination unit 52A determines whether or not the object has invaded a predetermined approach warning area based on the detection result of each surveillance camera 46. Specifically, the approach determination unit 52A is imaged by the surveillance camera 46. By performing image processing on the collected image information, it is determined whether or not an object has invaded the approach warning area.
The approach warning area is an area in which there is a high possibility that contact or collision between the gantry 18 and the object will occur when the object invades the area.
Therefore, when an object invades the approach warning area, it is necessary to operate the workbench 14 in a direction away from the object so that the workbench 14 and the object do not come closer to each other, and the gantry 18 needs to be operated. It is preferable that the worker P is retracted from the gantry 18 to the floor portion 16.

Further, in the present embodiment, when the worker detection unit 48 does not detect the worker P, the approach determination unit 52A sets the approach warning area as the first approach warning area, and the worker detection unit 48 sets the worker P. When is detected, the approach warning area is set as a second approach warning area that includes the first approach warning area and has a wider range than the first approach warning area.
Therefore, when the gantry 18 has the worker P, the gantry 18 uses a wider range of the approach warning area as compared with the case where the gantry 18 does not have the worker P, which is advantageous in determining the approach of the object earlier. Will be.

The alarm generation unit 52B generates an alarm when the approach determination unit 52A determines that an object has entered the approach warning area. In the present embodiment, the sound generation unit 50 is controlled to generate an alarm. Generates a warning tone or message.

Next, aerial work using the workbench 14 will be described.
Prior to the aerial work using the aerial work platform 10, the aerial work platform 10 is moved to the ground immediately below the work position and parked.
Then, one or a plurality of workers P board the workbench 14 and move to the floor 16 or the gantry 18.
In this state, the worker P operates the operation unit 20 of the workbench 14 to raise and extend the boom 12 to raise the workbench 14 and stop it at a desired work position. The worker P moves between the floor portion 16 and the plurality of floors to perform aerial work at a desired height position.
Therefore, various aerial work can be performed within a height range over a plurality of floors without raising and lowering the workbench 14 by the boom 12, which is advantageous in improving the efficiency of the aerial work.
Further, when the tip of the boom 12 is set to the highest position, the gantry 18 has a plurality of floors even in a high place that cannot be reached by the conventional workbench 14, so that the work in a high place can be performed.
In addition, when a temporary scaffold is installed at the site and work is performed at a high place, it is necessary to avoid the unstable ground part and assemble the scaffold, which is troublesome. On the other hand, in the present embodiment, the aerial work platform 10 can be stably parked, and it is sufficient to secure a parking space for one vehicle sufficient to raise and lower the workbench 14 on the ground surface. It is advantageous for improving efficiency.

Next, the operation of the workbench 14 when ascending will be described with reference to the flowchart of FIG.
First, the aerial work platform 10 is moved to the ground immediately below the work position and parked.
Then, the worker P gets on the workbench 14 and moves to the floor 16 or the gantry 18.
In this state, the worker P operates the operation unit 20 of the workbench 14 to raise and extend the boom 12 to raise the workbench 14 (step S10).
The worker detection unit 48 detects whether or not there is a worker P on the gantry 18 (step S12).
When the worker P is not detected on the gantry 18, the approach determination unit 52A sets the first approach warning area as the approach warning area (step S14).
When the worker P is detected on the gantry 18, the approach determination unit 52A sets a second approach warning area wider than the first approach warning area as the approach warning area (step S16).
Then, the approach determination unit 52A determines whether or not the object has invaded the approach warning area based on the image information supplied from each surveillance camera 46 (step S18).
If it is determined in step S18 that the object has not entered the approach warning area, the process returns to step S12, and the same control is repeated.

If it is determined in step S18 that the object has entered the approach warning area, the alarm generation unit 52B generates a warning sound or a warning announcement from the sound generation unit 50, and the worker P is carefully ventilated (step S20).
The worker P operates the operation unit 20 to cause the boom 12 to fall or shorten in response to the occurrence of the warning sound or the warning announcement, and separates the gantry 18 from the object. As a result, the gantry 18 and the object can be avoided from approaching each other.
Further, the worker P who was on the gantry 18 can go down the stairs 38 from the gantry 18 and evacuate to the floor 16 in response to the occurrence of the warning sound or the warning announcement.

In the present embodiment, the approach determination unit 52A sets the approach warning area to a wider range than the first approach warning area and the first approach warning area depending on whether or not the worker P is detected by the worker detection unit 48. Set to one of the second approach warning areas.
Therefore, when the gantry 18 has the worker P, the gantry 18 uses a wider range of the approach warning area as compared with the case where the gantry 18 does not have the worker P, which is advantageous in determining the approach of the object earlier. Will be.
Therefore, the closer the distance between the gantry 18 and the object is, the earlier the alarm is generated, which is advantageous for the worker P to operate the operation unit 20 to avoid the gantry 18 and the object from approaching each other. This is advantageous in quickly retracting the worker P on the gantry 18 close to the object from the gantry 18 to the floor portion 16.
Further, when there is no worker P on the gantry 18, the approach warning area is set to the first approach warning area narrower than the second approach warning area to allow the gantry 18 and the object to approach to some extent. This is advantageous in securing a wide range in which the worker P on the floor 16 can work at a high place.

It should be noted that the approach determination unit 52A does not switch the approach warning area between the first approach warning area and the second approach warning area and sets the approach warning area, and determines the approach of the object using a single approach warning area. It may be.
However, according to the present embodiment, the alarm generation timing can be changed according to the presence or absence of the worker P on the gantry 18, and the object can be accurately approached while improving the efficiency of aerial work. It is advantageous for warning.

Further, in the present embodiment, as the object detection unit, it is possible to image a range of 360 degrees centered on the optical axis extending upward in the vertical direction, and the optical axis is the center in a plane including the optical axis. Since the surveillance cameras 46 capable of capturing images in a range of 180 degrees are used, each surveillance camera 46 can cover a wide range and detect an object. Therefore, the number of surveillance cameras 46 can be suppressed, which is advantageous in accurately determining whether or not the gantry 18 is approaching the object while simplifying the configuration of the approach determination unit 52A.

It goes without saying that a millimeter-wave radar, a microwave radar, or an infrared radar may be used in addition to the surveillance camera 46, or these radars may be used in place of the surveillance camera 46 as the object detection unit.
The use of such a radar is advantageous in reliably detecting an object even at night or when the visibility is poor due to the influence of fog or the like.
However, since the detection range of the radar is narrower than that of the surveillance camera 46 capable of capturing a wide range as in the present embodiment, many radars are used to cover a wide range above and to the side of the gantry 18. Need to be provided.
On the other hand, when the surveillance camera 46 capable of photographing a wide range is used as the object detection unit as in the present embodiment, the object can approach the gantry 18 over a wide range while minimizing the number of surveillance cameras 46. It can be detected accurately, which is advantageous in suppressing the cost of the workbench 14.

10 ... aerial work platform, 12 ... boom, 14 ... work table, 16 ... floor, 18 ... stand, 22 ... object alarm device, 26 ... floor board, 28 ... handrail, 32 ... ... passage, 34 ... pillar, 36 ... beam, 38 ... stairs, 40 ... brace, 42 ... floor board, 44 ... handrail, 46 ... surveillance camera (object detection unit), 48 ... worker Detection unit, 50 ... Sound generation unit, 52 ... Control unit, 52A ... Approach determination unit, 52B ... Alarm generation unit.

Claims (6)

A workbench for aerial work platforms that can be attached to an elevating device that can be elevated.
A floor portion having a first rectangular shape in a plan view in which the elevating device is connected to the lower surface thereof and a first handrail is erected around the floor portion.
It is formed by columns and beams on the floor, has multiple floors, and has a second rectangle with a contour smaller than that of the first rectangle, and its long sides and short pieces are the first rectangle. Equipped with a stand parallel to the long and short sides,
The gantry is formed on a plurality of floors by columns and beams, and has stairs for ascending and descending from the floor to the beams constituting the floors.
The floor and the pedestal have a length along the long side and a width along the short side of the rectangle forming their plan view shape.
A floor board is installed on the beam constituting the top floor, and a second handrail is erected so as to surround the floor board.
The plan view shape of the top floor composed of the floor plate and the second handrail is a third rectangle having a first long side and a second long side with a contour smaller than that of the second rectangle. Presenting
When viewed in a plan view, the first long side of the third rectangle coincides with one long side of the second rectangle.
The pillars provided on the top floor and the floor immediately below the top floor are provided so as to extend from the first floor of the gantry to the top floor at the position of the first long side, and the second length. At the side points, the floor is inclined toward the first long side gradually from the floor directly below the top floor to the upper side.
In the width direction of the gantry between the pillar from the floor directly below the top floor to the first long side and the inclined pillar from the floor directly below the top floor to the second long side. The distance along is formed in a dimension that gradually decreases toward the top,
A workbench for aerial work platforms that features this. The second handrail is composed of a plurality of columns erected from beams constituting the top floor and a plurality of elongated members bridged between the columns.
The workbench for an aerial work platform according to claim 1, wherein the workbench is characterized in that. At the first long side portion, a plurality of pillars constituting the gantry are provided so as to extend above the beams forming the top floor to form the pillars.
The workbench for an aerial work platform according to claim 2, wherein the workbench is characterized in that. The gantry brings one long side of the second rectangle matching the first long side of the third rectangle to the long side of one of the two long sides of the first rectangle. Placed in
Between the other long side of the two long sides of the first rectangle and the other long side of the two long sides of the second rectangle on the floor, and the first. There is a passage between the two short sides of the rectangle and the two short sides of the second rectangle.
The workbench for an aerial work platform according to any one of claims 1 to 3, wherein the workbench is characterized by this. On the four sides of each floor of the gantry, braces are laid in a cross shape in a rectangular opening formed by the pillars and beams.
The workbench for an aerial work platform according to any one of claims 1 to 4, wherein the workbench is characterized by this. An operation unit for raising and lowering the workbench is provided at a location of the workbench that can be operated by a worker on the floor.
The workbench for an aerial work platform according to any one of claims 1 to 5, wherein the workbench is characterized by this.

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